How to Make FONDUE AU CRÉMANT (FONDUE WITH SPARKLING WINE)

Whisk together 2 tbsp sparkling wine and cornstarch in a small bowl; set aside. Rub garlic cloves over the interior of a 5-qt. pot and drop garlic into pot. Add remaining sparkling wine; bring to a boil and whisk in cornstarch mixture; discard garlic. Reduce heat to low; add cheeses in batches, stirring, until melted, 10 minutes. Stir together cognac and baking soda in a small bowl, add to pot, and stir until smooth. Stir in lemon juice and salt. Transfer to fondue pot, set over a lit Sterno cup, and serve with bread.